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According to railroad historians and railroad blueprints, the Whipple span of this two-span bridge originally was built in 1885 at Ridley Creek, Ridley Park, Pa. (southwest of Philadelphia), and was relocated to this location in 1909 when it was replaced with a deck truss span.

If this was really a railroad bridge I think it would be hard to even consider the Pratt a 1909 structure, let alone the Whipple. By 1909, railroad bridges were far more massive than this. Could this be a bridge relocated and reused in this place in 1909?

Either way, an excellent find, I was unaware of this rare bridge in DC.